Hmm... looks like Hyla Cinerea or the American Green Tree Frog. It looks like because in the second pic, you can see the single white stripe going from its head to rump, and by the small spots. Not all H. cinerea have spots and/or have the stripe, and not all are green. One way to know for sure is the call of the frog, at least for a male. In the wild, if one tree frog calls, others will follow in pursuit. Some would describe it as a cowbell or a duck. They are from the South Eastern United States, and get no bigger than 2.5 inches. Many consider them the best beginner tree frog. I will leave the rest to you.